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5. MONITOR FUNCTIONS AND THEIR USE
MELSEC-A
POINTS
•
The following diagram shows the location of display points when the
graph is displayed from the left:
(1) Trend graphs that can be monitor-registered
(a) A single trend graph can include up to 16 bars.
A single monitor screen can display up to 16 graphs.
(b) A scroll type graph can include up to 16 bars.
One graph can also be divided into several graphs.
For example, by using three trend graphs, five, three, and eight
bars (16 bars in all) can be included respectively.
(c) Sections 5.5.1.1,5.5.1.3 or 5.5.1.4 give details about the two
scroll types (screen display), overwrite types, and batch display
types.
(2) The relationship between the graph display range and dot spaces
(point spaces)
When a scroll type or overwrite type of trend graph is displayed, the
•
graph display for each item of collected data is shown below:
The length the graph bar extends or scrolls in the direction of the X
axis is governed by the following formula:
(Previously-displayed coordinate X)
±
(Point space).
When a trend graph for n items of collected data is displayed, the
calculation obtained from the following formula must be taken into
consideration:
(n (number of points) - 1) x (point space) +
1-
A trend graph display range corresponding to the number of dots
must be provided.
<Example>
When ten items of collected data are displayed in a scroll type trend
graph at intervals of 16 bits on the X axis, the graph sprite X axis
should have the length indicated below:
(10- 1) x 16 + 1
=
145 (dots).
5-56
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